Abstract: Combined with Wangjiawan central region development practice, through the utilization factor of water injection, water drive characteristic curve, increased rate of water cut and injection-production pressure system index calculation, the Wangjiawan central region water flooding development effect is analyzed. The calculation results show that : with the increase of recovery degree, water flooding effect is better, but the injection-production volume is not balanced. The pressure adjustment system is proposed to perfect water flooding well patterns.